Summary

I have configured a pppoe interface, CAKE QoS and I have attached cake qos to the pppoe interface. It works when I apply the config but the pppoe interface resets back to using fq_codel after the pppoe connection breaks and comes back online.

Steps to reproduce

Use the following config,

vyos@router# show qos
 interface pppoe0 {
     egress 95MB_LIMIT
 }
 interface ifb0 {
     egress 95MB_LIMIT
 }
 policy {
     cake 95MB_LIMIT {
         bandwidth 95mbit
         description "95mbps limit"
         flow-isolation {
             flow
         }
         rtt 100
     }
 }

vyos@router# show interfaces pppoe
 pppoe pppoe0 {
     authentication {
         password 
         username 
     }
     default-route-distance 1
     host-uniq C0FFEE00
     ip {
         adjust-mss clamp-mss-to-pmtu
     }
     mru 1492
     no-peer-dns
     source-interface eth0
     redirect ifb0
 }
vyos@router# show interfaces input
 input ifb0 {
     description "Redirect if for pppoe0"
 }

1. Apply this config.
2. qos on pppoe0 interface changes to cake.
3. Run, disconnect interface pppoe0 and then connect interface pppoe0.
4. qos on pppoe0 changes back to fq_codel.

Expected

It should use cake after reconnecting

What actually happens

It goes back to using fq_codel instead of using cake like it's supposed to.

Additional details

I have made a video to demonstrate this issue, It's not letting me attach it here so I had to upload it on youtube. Please see https://youtu.be/D4JEknrl23E